Operating-gear for hydraulic valves.



H. CROWE. OPERATING GEAR FOR HYDRAULIC VALVES.

APPLICATION FILED JUNE 24.1918.

' Patented Aug. 19, 1919.

' 2 SHEETS-SHEET 1- rm; COLUMBIA rLAxrmnm-n 01., WASHINGTON, n. c.

H. CROWE.

OPERATING GEAR FOR HYDRAULIC VALVES.

APPLICATION FILED JUNE 24' 19H}. 1 ,3 1 3, 523 Patented Aug. 19, 1919.

'2 SHEETS-SHEET 2.

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m-m tes ii srerataei Paten ed r ee!19. 9 -v l l I Applicationfiled'iune- 4, 1918. Serial No. 241 ,'59 8. Y

To all whom it may concern: i v

Be it-known that I, HENRY OR' ject of the Kingof}=E1i'glan d 3altburn{by-the-Sea,'in the con i England, have invented new (and useful provements in? Operating-Gears for" drauhcfValves, of which the follow ng-1s specifications) This invention has reference to" hydraulic valvesfof thetype desci ihedfininy specifi cation, Serial Number-f199,957{ filed Nov. 2, 1917, and adapted to'*'contro1* single; and double acting cylinders, "the improvements consisting' chiefly of the 'particul ar arrang'e mcnt 'andlfinethod cit gear ojgierating the valves; 1 The {valve 'coiisists in the case of f z l v i K c single acting valve of one lnlet and one exhaust miter valve, "andyin the" case of a dojuble acting valve; of two-inlet and twvo outlet or exhaust miter' 'val-ves," all placed on q I upperslcleofthe' inlet valve a Apassa'ge one center line. p

In ordeftli'atthe invent on may he clearly which I understood;*Iwrefei to thedrawings in j Figure 1 issectionalelevation taken through one of t the 'slniila'rly 5 constructedj binatlon wlth inlet or exhaust valves, 7 in -co the operating gear th 'ere for Fig. 2 is aside elevation of a cam or weigh ban I employito operate the v-al ves Figs.; 3 andl show different views respec i tively of the i arrangement of coupling the valves of a double acting v'ailve' with each;

exhaust or outlet valves ates In the asset a siiigle acting "valve the latter is coupled to a single acting hydraul ic cylinder, Figs. 5 and 6,: a -heing tl16-l11l6fi valve and=a the outlet or exhaust valve, 1 while L designates" the connection to the hy- 75 draul-icpressure sup l v main, lea-ding to the Q connects-th e underside of saidinlet .valve" (4 with the upper side of the exhaust valve a and connected. to and cominiinicating with 80 the passage Qis the branch R which i'ntumr forms a connection, with the single actin cyli1ider .S. -"P is the exhaustgjb'ranch or: outlet" connectedxto the underside ofgthe (EX-u haustvalve a ,Eig.,5z 1,

The gear for operatiii these valves consistsflofaicam shaft or weigh bar Y f, illus-r tratedmore clearly Figs; 1 i and 2; placed at a dist ance away from the 'centerline of: the val'ves,'the center line and pivot of rota 90 other and to aid'ouble acting 'hydrauli'c cyl tion being designated ancl Ytrespec; inder. i l .5: tively. Leversg'arelufurthermoreprovided;

Figs. '5 an d 6 represent views to show the connection'of the valves-oras rigle a'ctnig valve and its couplnig'tdtt si'ngle alctingi In the easeof douhleacti'ng valve there are two inlet valves a a and two outlet or exhaust miter valves a a all placed on one center line, Figs. 3 and 4; the underside of the inlet valve a being connected by a pas sage a to the topside of the exhaust valve (1 Similarly the underside of the inlet valve a is connected to the topside of the one for each valve andipla'cecl at -right angles tothe weigh bar f, caclv of wliichglevers is adapted to lift its own particular. valve when the weigh 'bar is being rocked; The weigh bar o-ricam shaftf is fornied with threecam surfaces- 7 K: f 1 Pkwhiclmiie so an ranged that their; 1 give great leverage and 'slow rnotion which is required when. justlOO opening the valvesagain'stlheavy hydraulic pressures, thus 7 dispensing; with the necesa sitv for pilot valves in a great many cases, and when once the valve is lifted off its seat,

the form of-the; camshaft or 'weigh bar gives thevalves quicker and high lift with less leverage. As will be seen from the sectional View in Fig. 1, the faces 7 f are the ones which actuate the levers g. The face f horizontally disposed and situated nearest the center of rotation Y, effects the gradual opening of the valve and acting as it does at a comparatively short leverage, is much eration when the extreme left hand corner is raised above the horizontal, the leverage in which case is considerably extended. But

at this stage the resistance to the opening offered by the valve is of course much less than at the initial stage, the result being that the lever g is lifted by the face f more rapidly though with less power than is the case when the face f is in operation. The right hand side cam face f is cut awayto provide clearance for the lever 9 when the cam or weigh bar is rocked inthe opposite direction to that just described.

From Figs. 1 and 2 it will be noted that the said cam faces are so arranged that when the inlet valve a is open, its companion exhaust valve a is closed; at the same time the exhaust valve a is open while its companion inlet valve (1 is closed. When the weigh bar 7 is moved over in the other direction the action of these various valves is of course reversed. It will be understood that the weigh bar or cam shaft is adapted to be oscillated by means of a lever or the like inserted in one of the holes 7, in the ends of same. The extent of the movement of the weigh bar is limitedby stops in the form of extensions in, k of the bedplate B of the valve.

The ends of the levers g, opposite the weigh bar 7, are carried on adjustable supports h, the object being to readily adjust the clearance z, between the valve spindle b and a spindle joperating or acting onsaid valve spindle and resting on the lever 9.

By this method of operating the valves, each lever. g operates its own particular valve, so that in the case of a double acting valve there are four levers, Figs. 3 and a,

while in the case of a single acting valve there are two levers only, Figs. 5 and 6. The cam shaft or weigh bar f, in {the latter case, is accordingly provided with correspondingly disposed sets of cam surfaces I same time and thus the hydraulic machinery which is controlled by this group valve is prevented from creeping, which it would do in the case of the ordinary method of construction where all the four valves are down on their respective seats.

This creeping takes place when an inlet valve slightly leaks and the. exhaust valve is comparatively tight. In practice this creeping often exists and it is entirely prevented in the "present arrangement.

Having now fully described my said invention what I claim and desire to secure by Letters Patent is i 1. In the herein described operating gear for hydraulic valves controlling a double acting hydraulic cylinder, the combination, with the said hydraulic valve consisting of two inlet and two exhaust miter valves all placed on one centerline, of a weigh bar placed at a distance from the center line of thevalves and having differential cam surfaces on one side of the center of rotation and a clearance space on the other side, a lever provided for each of the said inlet and exhaust miter'valves and resting with one end on the corresponding cam surface of theweigh bar, an adjustable support for the other end of said levers, a spindle resting on each of the levers and adapted to operate'the corresponding valve, and means to couple the hydraulic valve to the hydraulic cylinder, all as and for the purpose set forth and shown.

2. In operating gear for hydraulic valves, the combination, with;valve mechanism comprising an inlet and an exhaust miter valve connected with each other, of a weigh bar placed at a distance from the center line of the valves and having differential cam surfaces on one side of the center of rotation purpose set forth and shown.

In testimony whereof I have hereunto set my handin the presence of two subscribing witnesses.

' HENRY CROWE. Witnesses i JOHN WILLIAM WALTON,

FREDERICK CORNER.

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Washington, D. 0." e 

